Cornelis Leendert Bolijn, pseudonym Zwarte Kees was a skipper from Sliedrecht whose ship was seized by the Germans. As a Linie-crosser, he made 22 crossings between Sliedrecht and Lage Zwaluwe. This connection served to convey messages for the Dutch Bureau of Intelligence in liberated territory. Als hundreds of people including Allied pilots or soldiers left behind after the Battle of Arnhem were also transferred there. On the way back, they took food and medicines (especially Insulin) that were urgently needed.
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